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Old 03-30-2004, 02:52 PM   #1
RB
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How to Improve low end Torque

Hi Guys, been lurking while getting used to my 04 SVTF ZX5 with Euro Package. I have lots of cars (this is #7), bought it for fun, and it is that. No unreal expectations, and the car satisfies and delivers beyond expectations in almost every category - except one.

This car has horrendous low rpm throttle response. With AC on I almost stall, and feel no response until about 2000rpm. Even with AC off I call throttle response "marginal" at low rpms. I also have what appears to be a "sticky throttle", but upon further inspection I realized that with no throttle input air pressure is creating backpressure against the throttle body and the throttle feels like its "stuck". Pop the throttle (break the vacuum) and all is OK. If I remove the air filter problem goes away too.

This, IMHO, sucks, and not in a good way.

So I have a very different question from archives about "performance" air intakes. I have no interest in more horsepower (remember 7 cars - 2 Porsches, SHO, etc.). What I want is the "best" solution for a responsive throttle at low rpms. Will I get this with a simple K&N or ITG drop in filter, or do I need aftermarket air intake?

Remember, I just want a throttle that doesn't feel stuck (makes stop and go traffic a bear), and just a wee bit more response below 2000 to not feel like I am going to stall.

I can tell the folks here can answer this question if I have stated it correctly. I hope I have. And I really hope this isn't to bland for most of you racers...

PS - The Recaros in the Euro Package are A+, better than my Scheel racing seat.


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Old 03-30-2004, 02:55 PM   #2
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Well, welcome to the site and good choice of car. I also have a Euro package SVT and love the seats as well. I'm not sure of an answer for you, but I figured I'd welcome you.
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Old 03-30-2004, 02:57 PM   #3
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Wouldn't a 65mm throttle body be a good bet?


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Old 03-30-2004, 03:16 PM   #4
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yea get a 65mm throttle body cause the svt oftenly has problems with throttle response and i have a K&N air filter and there was a noticable diference for me
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Old 03-30-2004, 03:16 PM   #5
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The one that comes with the SVTF is 66mm TB.
Not sure if the 65mm will improve his throttle response.

I'm sure someone with an SVTF has a 65mm TB that can state it's effects on throttle response.
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Old 03-30-2004, 03:55 PM   #6
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underdrive pulley

In your post the first thing you mention is how the car performs with the AC on.

You might want to look into a UDP, you could blast the air all day and feel no parasidic effects.
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Old 03-30-2004, 04:01 PM   #7
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A UDP might help when the AC is on but he said that it's also an issue with the AC off.

"Even with AC off I call throttle response "marginal" at low rpms"
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Old 03-30-2004, 04:07 PM   #8
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You want low end, get a V8.
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Old 03-30-2004, 04:25 PM   #9
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First of all, I suggest going back to one of your porsches if you want low end torque :-D Hard to beat a 911...but then again it's hard to beat the SVT for its package!

I took off my short air intake snorkle and noticed a difference in throttle response, plus a nice sound. I suggest trying that. But as far as torque....

By the way i'm a newb myself! What's up y'all, the focus SVT is the shit by far!!!
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Old 03-30-2004, 04:57 PM   #10
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Which one is better though, the ITG Drop-in or the K&N drop-in?
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